Possibly a "highest number tested" or "all numbers below ___ have been tested". It'd been nice to see how high we've gotten and how close we are to the next milestone.

The numbers being checked range from 2,397,514,757,837,686,833,152 to 2,398,879,634,913,199,390,720. But by the time I finish writing this, it may have changed. With 60K files being processed at any given time and with up to 2^40 numbers being checked per WU, giving an exact number is not feasible as the number could change multiple times every second. But, if you want a general idea, sort your work units by name in BOINC manager and look at the first number in the work unit name. That number is somewhere between the start and end of the numbers being checked.